NATO Small Arms Ammunition is firearms ammunition used within NATO.Some of these loads include:

.22 cal cartridge: The smallest round in common use within NATO countries. Used in training and cadet forces. Not an operational round.

9 mm cartridge: A low velocity round used in pistols and sub-machine guns. Probably the most familiar round to the public.

5.56 cartridge; The most used round in NATO Armed Forces. A relatively new round introduced in the 1960's with the M-16, itself the second most produced assault rifle after the Kalashnikov AK 47.

7.62 cartridge "Full Metal Jacket": An older far more powerful assault rife - Light/medium/general purpose machine gun round. Was largely replaced with the 5.56 during the 1980s/90s, but still the most common round for medium and GP machine guns.

0.5 cal cartridge. The largest small arms round commonly used in NATO Armed Forces. Used in the M2 Browning heavy machine gun and similar weapons.